#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	double a = 0;
	double b = 0;
	char c = 0;
	scanf("%lf %c %lf", &a, &c, &b);
	switch (c)
	{
	case '+':
	{
		printf("%lf", a + b);
		break;
	}
	case'-':
	{
		printf("%lf", a - b);
		break;
	}
	case'/':
	{
		if (b == 0)
		{
			printf("Wrong!Division by zero!");
			break;
		}
		else
		{
			printf("%.2lf", a / 1.0 / b);
			break;
		}
	default:
		printf("Invalid operation!");
	}
	return 0;
	}
}